Request for permission heard to have holiday paid for? (2-4-5)

I believe the answer is:

by-your-leave

I'm a little stuck... Click here to teach me more about this clue!

'request for permission' is the definition.
(I've seen this in another clue)

I don't understand how the rest of the clue works.

I've seen this clue in The Times.

Want a hint initially instead of a full solution? Install my app